polylang / include / cache.php

cache.php in Polylang 3.5, at include/cache.php

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1	<?php
2	/**
3	* @package Polylang
4	*/
5
6	/**
7	* An extremely simple non persistent cache system.
8	*
9	* @since 1.7
10	*/
11	class PLL_Cache {
12	/**
13	* Current site id.
14	*
15	* @var int
16	*/
17	protected $blog_id;
18
19	/**
20	* The cache container.
21	*
22	* @var array
23	*/
24	protected $cache = array();
25
26	/**
27	* Constructor.
28	*
29	* @since 1.7
30	*/
31	public function __construct() {
32	$this->blog_id = get_current_blog_id();
33	add_action( 'switch_blog', array( $this, 'switch_blog' ) );
34	}
35
36	/**
37	* Called when switching blog.
38	*
39	* @since 1.7
40	*
41	* @param int $new_blog_id New blog ID.
42	* @return void
43	*/
44	public function switch_blog( $new_blog_id ) {
45	$this->blog_id = $new_blog_id;
46	}
47
48	/**
49	* Add a value in cache.
50	*
51	* @since 1.7
52	*
53	* @param string $key Cache key.
54	* @param mixed $data The value to add to the cache.
55	* @return void
56	*/
57	public function set( $key, $data ) {
58	$this->cache[ $this->blog_id ][ $key ] = $data;
59	}
60
61	/**
62	* Get value from cache.
63	*
64	* @since 1.7
65	*
66	* @param string $key Cache key.
67	* @return mixed
68	*/
69	public function get( $key ) {
70	return isset( $this->cache[ $this->blog_id ][ $key ] ) ? $this->cache[ $this->blog_id ][ $key ] : false;
71	}
72
73	/**
74	* Clean the cache (for this blog only).
75	*
76	* @since 1.7
77	*
78	* @param string $key Cache key.
79	* @return void
80	*/
81	public function clean( $key = '' ) {
82	if ( empty( $key ) ) {
83	unset( $this->cache[ $this->blog_id ] );
84	} else {
85	unset( $this->cache[ $this->blog_id ][ $key ] );
86	}
87	}
88	}
89